Heating unit.



G.SKSTBWARD.

HEATING UNIT.

APPLIOATION FILED DEG. 9, 1913.

Paxented-Apr-21 J 1 Vusz H101,

Clarence/S Seww'd j/M/ /partment desi passage being heated from the electric curthe novel construction and in the peculiar on, which form a part of this specification.

v CLARENCE B. STEWAABD, 0F CHTTANOOGA, TENDIESSEE.

" HEATING UNIT. 5

Bpecication f Letters Patent.

Patented apr. 21, 1914.

application mea December 9, 1913. semi No. 805,587.

To all whom 'it may concern.

1 Beit known that I, CLARENCE S. STEWARD, a citizen of the United States, residing at Chattanooga, in the county of Hamilton and State of Tennessee, have vinvented certain new and useful Improvements in Heating Units; and I do hereby declare the followin to be a full, clear, and exact description o the invention, such as will enable lothers skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to the letters and figures of reference marked there- This invention relates to certain new and useful improvements in heating units for electrical heaters and it has for its object the provision of a unit of this character constructed of suitable non-conducting material and of any desired shape, one of the faces of the unit being provided with grooves@ arranged in parallel relationship and extending transversely across the facev of the unit, the said rooves being wider atthe bottom than at t 'e surface of-the unit and with widened portion forming a comed to receive ,a resistance wire, either coiled or in other form, thus retaining the wire against possible accidental displacement. A 1 1 7 The nventionhas for a further object the improvement of units of this character, the improvement consisting essentially in the provision of either slots or openings communicating between the lower surface of the unit and the chamber containing the resist-y ance wire., thus permitting a fiee circulation of air through the unit, the' air in its rent and which unit also serves to -be heated from contact with and proximity to the heated wire whereby the air may be vdrawn in from beneath the unit through theorices provided below the wires and inpassing over the heated wires through and around the heated unitwill serve to elevate the tem-I perature andcause a continuous circulation. of heated air through the unit.

To these ends and to'such others as t-he inventionmay'pertain, the same consists of arrangement, combination and adaptation of parts, 'all as will be more fully hereinafter described, shown in the accompanying drawings andthen specifically defined inthe ap# pended claims.

The invention is clearly illustrated in the accompanying drawings which, with the numerals of reference form a part of this specification and in which Figure l is a top plan view of a heat unit embodying the features of lmy invention. Fig. 2 is a bottom plan view of the same.

y, Fig. 3 is a detail sectional view taken on line 3-3 of Fig. l. Fig. 4 is a like view of a slightly 'modified form of constructionand Fig. 5 is a sectional view on Fig. 2.'

Reference now being had to the details lof the drawings by numeral, l designates a disk constructed preferably of steatite or soapstone or other noncombustible material adapted for the purpose. Disposed'at'interf vals and extending transversely across the upper face of the disk'are a series of para lel grooves 2, 2. These grooves are open at their ends and have their lower portions milled out to form an enlarged portion 3 designed for receiving the resistance wire 4. Each alternate end of the bars 5which separate the parallel slots 2, is cut away, as

shown at 6, 6, and within these cutaway portions are provided lugs 7, ythe upper face lof which lugs or stops are disposed slightly f below the face of the lunit and serve to lock the resistance wire against accidental displacement.

Directly beneath .the enlarged portions orA chambers and formingpommunication between the resistance wlre chambers and the under face of the umt are provided conaol tracted slots 8 connecting the wire chambers with the surface of the` disk, as illustrated in Fig. 1 or, if preferred, communication between the wire chambers and the under surface of the disk may, in lieu of the slots, be

obtained through perforations 9, such as illustrated inthe modified form, Fig. 4.

While I have shown and described a unit f of 'cylindrical form and prefer such construction, it is at once evident that the body of the unit may, if desired, b'e rectangular or elliptical or of any desired shape, or may be constructed of two or more pieces which, when suitably joined and held together by means of a metallic rim or otherwise, will approximate the same result as obtained by the use of a single piece of material and my inventionl c onteinplates such a modication. f

From the foregoing description, the construction andthe advantages derived from the use of the invention Will at once be apparent.

What I claim to be new is 1. A heating unit for electric heaters comprising a single disk, one face of which has a series of grooves formedv therein` each groove leading into a chambered portion of greater diameter than the Width of said grooves, the bottom of each chamber having openings leading through the disk, affording means for introducing air into the chambers, said grooves adapted to contain resistance Wires, substantially a's shown and described.

2. A heating unit for electric heaters, the same comprising a disk having one of its faces provided with a series of grooves arranged in parallel relationship and communicating with chambers of greater diameter than the Width of the slots and de signed to receive a resistance Wire, said disk being also provided with slots or air inlets disposed upon the under side thereof and communicating with the Wire chambers, substantially as shown and described.

3. A heating unit for electric heaters, the same comprising a disk or body portion of electrically insulated and heat storing material, said disk having one of its faces provided with a series of'slots disposed in parallel relationship and communicating with enlarged chambers adapted to receive resistance wires and the opposite side of the disk being provided with air passages communicating with the Wire chambers, substantially as shown and described.

In testimony whereof I hereunto ailix my signature in presence of tWo witnesses.

CLARENCE S. STEWARD.

Witnesses IDA MCCARRON, J. H. WooDY. 

